HD64F2149YV datasheet(402/1075 Pages) RENESAS

Nome de Peças	HD64F2149YV

Descrição Electrónicos	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

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Fabricante Electrônico	RENESAS [Renesas Technology Corp]

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Section 12 8-Bit Timers

Rev. 3.00 Jan 18, 2006 page 374 of 1044

REJ09B0280-0300

Table 12.6

TMRY 8-Bit Timer Interrupt Sources

Interrupt source

Description

DTC Activation

Interrupt Priority

CMIA

Requested by CMFA

Possible

High

CMIB

Requested by CMFB

Possible

OVI

Requested by OVF

Not possible

Low

12.5

8-Bit Timer Application Example

In the example below, the 8-bit timer is used to generate a pulse output with a selected duty cycle,

as shown in figure 12.12. The control bits are set as follows:

• In TCR, CCLR1 is cleared to 0 and CCLR0 is set to 1 so that the timer counter is cleared by a

TCORA compare-match.

• In TCSR, bits OS3 to OS0 are set to B'0110, causing 1 output at a TCORA compare-match and

0 output at a TCORB compare-match.

With these settings, the 8-bit timer provides output of pulses at a rate determined by TCORA with

a pulse width determined by TCORB. No software intervention is required.

TCNT

H'FF

Counter clear

TCORA

TCORB

H'00

TMO

Figure 12.12 Pulse Output (Example)

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